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Question

If y=(ax)(xb)(ab)tan1(axxb), then dydx is equal to

A
(ax)(xb)
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B
1(ax)(xb)
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C
(axxb)
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D
(xbax)
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Solution

The correct option is C (axxb)
Let x=acos2θ+bsin2θ
ax=(ab)sin2θ,xb=(ab)cos2θy=(a+b)sinθcosθ(ab)θ=(ab)sin2θ2(ab)θdydθ=(ab)cos2θ(ab)=(ab)2sin2θ=2(ab)sin2θ
and dxdθ=(ba)sin2θdydx=2(ab)sin2θ(ba)sin2θ=tanθ=(axxb)

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